Traditional watermarks may be applied to visible media (like images or video), whereas in digital watermarking, the signal may be audio, pictures, video, texts or 3D models. If a digital watermark distorts the carrier signal in a way that it becomes easily perceivable, it may be considered less effective depending on its purpose. Like traditional physical watermarks, digital watermarks are often only perceptible under certain conditions, e.g. It is prominently used for tracing copyright infringements and for banknote authentication. Digital watermarks may be used to verify the authenticity or integrity of the carrier signal or to show the identity of its owners. "Watermarking" is the process of hiding digital information in a carrier signal the hidden information should, but does not need to, contain a relation to the carrier signal. It is typically used to identify ownership of the copyright of such signal. A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data.
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